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    The chemistry of transient microstructures in the diffuse interstellar medium

    Bell, T.A. and Viti, S. and Williams, D.A. and Crawford, Ian and Price, R.J. (2005) The chemistry of transient microstructures in the diffuse interstellar medium. Monthly Notices of the Royal Astronomical Society 357 (3), pp. 961-966. ISSN 0035-8711.

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    Transient microstructure in the diffuse interstellar medium (ISM) has been observed towards Galactic and extragalactic sources for decades, usually in lines of atoms and ions, and, more recently, in molecular lines. Evidently, there is a molecular component to the transient microstructure. In this paper, we explore the chemistry that may arise in such microstructure. We use a photodissociation region (PDR) code to model the conditions of relatively high density, low temperature, very low visual extinction and very short elapsed time that are appropriate for these objects. We find that there is a well-defined region of parameter space where detectable abundances of molecular species might be found. The best matching models are those where the interstellar microstructure is young (<100 yr), small (∼100 au) and dense (>104 cm−3).


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: Sarah Hall
    Date Deposited: 06 Aug 2019 15:59
    Last Modified: 02 Aug 2023 17:53


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